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What's the difference between this and a Stellartone varitone?
If you mean the Tonestyler, I'd imagine not much. Some people have said that the TS is about changing resonance, not capacitance, which I'm not entirely convinced is true, but I could be wrong. This is a cheap way to experiment.
Changing the capacitance or resistance will inherently shift the resonant peak, so I don't think they're mutually exclusive.
You don't see this effect with a traditional tone control because the resistance of the tone pot damps the resonance. However as the tone pot reaches its minimum value you will see a resonant peak even with a traditional tone control. The difference is that the "tonestyler" has a resonant peak at every setting where the traditional tone control has one only when nearly completely rolled off.
This... was what I was trying to say.I know they're not mutually exclusive, I just suck at explaining. lol. I mean, I don't see much of a difference between a Tonestyler and any other switched-cap tone control (including the homebrewed ones.) Is there some other kind of mojo going on with them or...?
Yeah, they are not mutually exclusive, they are joined at the hip. A switched capacitor tone control has a response something like this:
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You get a resonant peak just below the cutoff frequency due to the inductance of the pickup and the capacitance of the tone control. Selecting bigger and bigger capacitors moves the resonant peak and the cutoff frequency lower and lower. You don't see this effect with a traditional tone control because the resistance of the tone pot damps the resonance. However as the tone pot reaches its minimum value you will see a resonant peak even with a traditional tone control. The difference is that the "tonestyler" has a resonant peak at every setting where the traditional tone control has one only when nearly completely rolled off. At higher settings it has a smooth, peak free (overdamped), roll off whose cutoff frequency varies with the pot setting.
BTW, the natural frequency of the resonance in radians/second is:
w = 1 / sqrt( C * L )
where w is the frequency, C is the tone capacitance plus any stray capacitance in the wiring, and L is the pickup inductance. The sqrt() function just means you need to take the square root of L * C. If you want the frequency in Hz you divide w by 2*pi. You cannot change C without changing f and w.
Ken